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  1. Prepare
  2. Python
  3. Regex and Parsing
  4. Validating Roman Numerals
  5. Discussions

Validating Roman Numerals

  • solders_array0m
     + 1 comment
    # Make the regex intent clearer and allow use of named groups for debug

import re
start = r"^"
thousands = r"(?P<thousands>M{0,3})"
hundreds = r"(?P<hundreds>CM|CD|(D{0,1}C{0,3}))"
tens = r"(?P<tens>XC|XL|(L{0,1}X{0,3}))"
units = r"(?P<units>IX|IV|(V{0,1}I{0,3}))"
end = r"$"
regex_pattern = rf"{start}{thousands}{hundreds}{tens}{units}{end}"	 # Do not delete 'r'.